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An amber box with dots inside: the soot filter is clogging.
Also known as: DPF light, Box with dots in it on the dashboard
A rectangle with spots in it, standing for a filter full of trapped soot. It is the one dashboard warning whose remedy is usually to drive further rather than to stop.
An amber tell-tale showing a filter body with particles inside, indicating that the diesel particulate filter is loaded with soot and needs to regenerate.
What this lamp means on a particular vehicle, and what to do about it, is in that vehicle's handbook. The symbol names the system; it does not diagnose the fault.
Contexts: Vehicle dashboard
Regeneration burns the trapped soot off and needs sustained higher-speed running to reach temperature, which is why short-journey use is what causes the warning in the first place.
What this lamp means on a particular vehicle, and what to do about it, is in that vehicle's handbook. The symbol names the system; it does not diagnose the fault.
A rectangle or rounded box containing a scatter of small dots, sometimes with a curved arrow or exhaust outline around it.